课文填空.根据课文原文,填入所缺内容.★ It was not immediately obvious that water was 1 the develop

课文填空。
根据课文原文,填入所缺内容.
★ It was not immediately obvious that water was     1     the development of life.
★ This produced   2  , which made it possible for life to develop.
★ I earned my passage by working as an unpaid hand, which   3  .
★ When they crossed the Rocky mountain, they    4   some mountain goats and even
      a grizzly and an eagle.
★ Many of them   5  riding wild horses and can win thousands of dollars.

试题答案

1. to be fundamental to           
2. a chain reaction  
3. accounted for my appearance    
4. managed to catch sight of
5. have a gift for